US3813783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio navigation plotter
Assignee: Individual
•
Filing: 1972-02-22
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Granted: 1974-06-04
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Expires: 1992-02-22
Abstract
Abstract A radio navigation plotter having: (1) a circular transparent upper disc with a 360 degree scale on its periphery and a circular line for registration with an OMNI station circle on a chart; (2) a circular transparent lower disc having a center marking, a diametrical North-South line, and two series each of closely spaced North-South and East-West lines to facilitate aligning the diametrical North-South line with a North- South line on a chart; and (3) an elongated arm pivoted centrally on the discs and having a longitudinal slot extending radially outward at one side of the discs and a bearing marker registering with the 360 degree scale on the upper disc at the opposite side.
Inventors
- 👤 R Price
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:38
CPC Classifications
G; G06; G06G; G06G1/00; G06G1/0005; G06G1/0052; G01; G01C; G01C21/00; G01C21/20; G01S; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
166 words
A radio navigation plotter comprising: first and second concentric discs, said second disc having a 360 degree calibrated scale extending circularly about its center, and said first disc having a diametrical North-South line thereon, said first disc being rotatable with respect to said second disc about their common center to displace said NorthSouth line angularly from alignment with the 0-180 axis of the 360 degree scale according to the magnetic variation at a particular geographic location, one of said discs having a center marking and being transparent around said center marking; and an elongated arm pivoted on said discs to turn about their common center, said arm extending laterally beyond one side of the discs and presenting a straight edge which extends radially outward beyond said discs, said arm having a marker aligned with said straight edge and located at the opposite side of the common center of the discs to designate on said scale an angle 180 from the angular position of said straight edge.
Claim 2
Dependent Claim
166 words
A radio navigation plotter comprising: first and second concentric discs, said second disc having a 360 degree calibrated scale extending circularly about its center, and said first disc having a diametrical North-South line thereon, said first disc being rotatable with respect to said second disc about their common center to displace said NorthSouth line angularly from alignment with the 0-180 axis of the 360 degree scale according to the magnetic variation at a particular geographic location, one of said discs having a center marking and being transparent around said center marking; and an elongated arm pivoted on said discs to turn about their common center, said arm extending laterally beyond one side of the discs and presenting a straight edge which extends radially outward beyond said discs, said arm having a marker aligned with said straight edge and located at the opposite side of the common center of the discs to designate on said scale an angle 180 from the angular position of said straight edge.
Claim 3
Dependent Claim
33 words
A plotter according to claim 1, wherein said first disc has a plurality of closely spaced lines thEreon extending parallel to said diametrical North-South line and disposed on opposite sides of the latter.
Claim 4
Dependent Claim
46 words
A plotter according to claim 1, wherein said first disc has a projection extending beyond the periphery of said second disc and aligned with said diametrical North-South line on said first disc for indicating the magnetic variation on said 360 degree scale on said second disc.
Claim 5
Dependent Claim
120 words
A plotter according to claim 3, wherein said second disc has a circular line thereon located inward from and concentric with said 360 degree scale and of the same size as an OMNI station circle on a Sectional Chart, said first disc has a plurality of closely spaced lines thereon which extend parallel to said diametrical North-South line and are disposed on opposite sides of the latter, said elongated arm has a longitudinal slot therein which defines said straight edge, and said arm has two scales, one calibrated for statute miles and the other calibrated for nautical miles, which are located respectively on opposite sides of said slot and are calibrated respectively radially outward from the center of the discs.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |